.mobile-nav {
  display: none;
  background: #222;
  text-align: center;
}

.mobile-nav a {
  display: inline-block;
  padding: 10px;
  color: white;
  text-decoration: none;
}

@media (max-width: 768px) {
  .mobile-nav {
    display: block;
  }

  .sidebar {
    display: none;
  }
}